夜夜音ぽんぽん (Yoyone, Ponpon) is a CVVC type Japanese voicebank that was created in an attempt to create a new UTAUloid. However, upon completion of the voicebank, it was noted as having a muffled sound when singing with difficult pronunciation. As such certain sounds like "sa" "se" and "so" are hard to understand when singing those sounds.

Because of this Ponpon has been considered a failed attempt at a new UTAU by their creator and will most likely not receive any future updates.